Public methods
Phosphorus Fractionation Sediment Test
Lake Pulse reports measurements. It does not score, rate, rank or forecast lakes or properties.
What it measures
What's measured & how
10 parameters · Sediment phosphorus fractionation (sequential extraction)
- Value type
- Not published
| Parameter | Result type | Unit | RL | Analytical method |
|---|---|---|---|---|
| Total Phosphorus | Quantitative | mg/kg as P | 2 | Rydin & Welch sequential extraction |
| Loosely bound phosphorus | Quantitative | mg/kg as P | 2 | Rydin & Welch sequential extraction |
| Iron-bound phosphorus | Quantitative | mg/kg as P | 2 | Rydin & Welch sequential extraction |
| Aluminum-bound phosphorus | Quantitative | mg/kg as P | 2 | Rydin & Welch sequential extraction |
| Calcium-bound phosphorus | Quantitative | mg/kg as P | 2 | Rydin & Welch sequential extraction |
| Biogenic phosphorus | Quantitative | mg/kg as P | 2 | Rydin & Welch sequential extraction |
| Organic phosphorus | Quantitative | mg/kg as P | 2 | Rydin & Welch sequential extraction |
| Total organic carbon | Quantitative | |||
| Total solids | Quantitative | |||
| Percent water | Quantitative | % |
- Total Phosphorus
- Result type:
- Quantitative
- Unit:
- mg/kg as P
- RL:
- 2
- Analytical method:
- Rydin & Welch sequential extraction
- Loosely bound phosphorus
- Result type:
- Quantitative
- Unit:
- mg/kg as P
- RL:
- 2
- Analytical method:
- Rydin & Welch sequential extraction
- Iron-bound phosphorus
- Result type:
- Quantitative
- Unit:
- mg/kg as P
- RL:
- 2
- Analytical method:
- Rydin & Welch sequential extraction
- Aluminum-bound phosphorus
- Result type:
- Quantitative
- Unit:
- mg/kg as P
- RL:
- 2
- Analytical method:
- Rydin & Welch sequential extraction
- Calcium-bound phosphorus
- Result type:
- Quantitative
- Unit:
- mg/kg as P
- RL:
- 2
- Analytical method:
- Rydin & Welch sequential extraction
- Biogenic phosphorus
- Result type:
- Quantitative
- Unit:
- mg/kg as P
- RL:
- 2
- Analytical method:
- Rydin & Welch sequential extraction
- Organic phosphorus
- Result type:
- Quantitative
- Unit:
- mg/kg as P
- RL:
- 2
- Analytical method:
- Rydin & Welch sequential extraction
- Total organic carbon
- Result type:
- Quantitative
- Unit:
- RL:
- Analytical method:
- Total solids
- Result type:
- Quantitative
- Unit:
- RL:
- Analytical method:
- Percent water
- Result type:
- Quantitative
- Unit:
- %
- RL:
- Analytical method:
MDL = method detection limit. RL = reporting limit. Provided by the performing laboratory.
You get
- Signed laboratory report, filed in your lake's Documents & Reports
- Each result loaded into your lake's Data Library (Plus, Lake Admin, PRO)
How it's produced
- Test type
- Sediment phosphorus fractionation (sequential extraction)
- Sample
- Top 10 cm of lakebed sediment from the deep basin, collected with a corer or dredge you supply (not included)
- Return shipping
- Prepaid 2-day return to the laboratory
- Analyzed by
- Independent accredited partner laboratory, with full chain of custody
- Method basis
- Non-EPA (Rydin & Welch)
- Turnaround
- 10 business days from lab receipt
- Analytical method
- Rydin & Welch sequential extraction
How (lab/instrument, method)
- Test type
- Sediment phosphorus fractionation (sequential extraction)
- Sample
- Top 10 cm of lakebed sediment from the deep basin, collected with a corer or dredge you supply (not included)
- Return shipping
- Prepaid 2-day return to the laboratory
- Analyzed by
- Independent accredited partner laboratory, with full chain of custody
- Method basis
- Non-EPA (Rydin & Welch)
- Turnaround
- 10 business days from lab receipt
- Analytical method
- Rydin & Welch sequential extraction
Limits (MDL/RL, resolution, interval)
Published limits appear with their parameters in the measurement box above. Unspecified detection limits, reporting limits, resolution, and reading intervals are not inferred.
Value type
Not supplied in the product's published methods.
What it can and can't tell you
Every result shows the date and time the sample was collected. Results reflect one sample, collected at a specific place and depth, and analyzed by an independent accredited laboratory using the method listed on this page. Lake conditions change across a lake and over time, sometimes within hours, in ways a single sample may not capture. Every method has detection and reporting limits; where the laboratory provides them, they are reported with your results. A detection is not a diagnosis, and a non-detection does not prove absence. Results are not a regulatory or compliance determination unless the agency involved accepts them as one. Results can help you make decisions about safe swimming and water use, but no result is definitive for every place and time. It is always good practice to check posted signs and your state or local health authorities. Recommendations are options to consider; decisions, and responsibility for any action taken, rest with you. This test uses a screening or non-EPA method. Results are intended for management decisions, not regulatory determinations. Sediment results describe the sampled location and depth interval only. Sediment varies considerably across a lakebed.
Version and last updated date
- Methods version
- Not supplied in the product's published methods.
- Last updated
- Not supplied in the product's published methods.
